Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords
dc.contributor.author | Holding, Johnna M. | |
dc.contributor.author | Duarte, Carlos M. | |
dc.contributor.author | Delgado-Huertas, Antonio | |
dc.contributor.author | Soetaert, Karline | |
dc.contributor.author | Vonk, Jorien E. | |
dc.contributor.author | Agusti, Susana | |
dc.contributor.author | Wassmann, Paul | |
dc.contributor.author | Middelburg, Jack J. | |
dc.date.accessioned | 2017-04-10T07:49:49Z | |
dc.date.available | 2017-04-10T07:49:49Z | |
dc.date.issued | 2017-03-27 | |
dc.identifier.citation | Holding JM, Duarte CM, Delgado-Huertas A, Soetaert K, Vonk JE, et al. (2017) Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords. Limnology and Oceanography. Available: http://dx.doi.org/10.1002/lno.10526. | |
dc.identifier.issn | 0024-3590 | |
dc.identifier.doi | 10.1002/lno.10526 | |
dc.identifier.uri | http://hdl.handle.net/10754/623071 | |
dc.description.abstract | Rising temperatures in the Arctic Ocean are causing sea ice and glaciers to melt at record breaking rates, which has consequences for carbon cycling in the Arctic Ocean that are yet to be fully understood. Microbial carbon cycling is driven by internal processing of in situ produced organic carbon (OC), however recent research suggests that melt water from sea ice and glaciers could introduce an allochthonous source of OC to the microbial food web with ramifications for the metabolic balance of plankton communities. In this study, we characterized autochthonous and allochthonous sources of OC to the Western Svalbard fjord system using stable isotopes of carbon. We quantified δ13C of eukaryotic and prokaryotic planktonic groups using polar lipid-derived fatty acids as biomarkers in addition to measuring δ13C of marine particulate OC and dissolved OC from glacial runoff. δ13C of bacteria (−22.5‰) was higher than that of glacial runoff OC (−28.5‰) and other phytoplankton groups (−24.7 to −29.1‰), which suggests that marine bacteria preferentially use a third source of OC. We present a Bayesian three-source δ13C mixing model whereby ∼ 60% of bacteria carbon is derived from OC in sea ice, and the remaining carbon is derived from autochthonous production and glacial-derived OC. These results suggest that subsidies of OC from melting glaciers will not likely influence microbial carbon cycling in Svalbard fjords in the future and that further research is needed to determine the effects of melting sea ice on microbial carbon cycling in fjord systems and elsewhere in the Arctic Ocean. | |
dc.description.sponsorship | We thank the captain and crew of the R/V Helmer Hanssen, J.C. Alonso for nutrient measurements, A. Dorsett for assistance with DOC measurements, Pieter van Rijswijk and Peter van Breugel for assistance with PLFA analysis and measurements, the Royal Netherlands Institute for Sea research (NIOZ) in Yerseke for accommodation, laboratory space, and technical support, and D. van Oevelen for coordinating analyses at NIOZ. This research was supported by the ARCTICMED project funded by the Spanish Ministry of Economy and Inovation (ref. CTM2011-15792-E) and the Netherlands Earth System Science Center. J.H. was supported by a JAE fellowship (CSIC, Spain). | |
dc.publisher | Wiley | |
dc.relation.url | http://onlinelibrary.wiley.com/doi/10.1002/lno.10526/full | |
dc.rights | Archived with thanks to Limnology and Oceanography | |
dc.title | Autochthonous and allochthonous contributions of organic carbon to microbial food webs in Svalbard fjords | |
dc.type | Article | |
dc.contributor.department | Biological and Environmental Sciences and Engineering (BESE) Division | |
dc.contributor.department | Marine Science Program | |
dc.contributor.department | Red Sea Research Center (RSRC) | |
dc.identifier.journal | Limnology and Oceanography | |
dc.eprint.version | Publisher's Version/PDF | |
dc.contributor.institution | Department of Global Change Research; Instituto Mediterráneo de Estudios Avanzados (CSIC- Univ. Islas Balears); Esporles Spain | |
dc.contributor.institution | Arctic Research Centre, Bioscience, Aarhus University; Aarhus C Denmark | |
dc.contributor.institution | Faculty of Biosciences; Fisheries and Economics, UiT, The Arctic University of Norway; Tromso, Norway | |
dc.contributor.institution | Laboratorio de Biogeoquímica de Isótopos Estables, Instituto Andaluz de Ciencias de la Tierra (CSIC-Univ. Granada); Granada Spain | |
dc.contributor.institution | Department of Estuarine and Delta Systems; Royal Netherlands Institute for Sea Research; Yerseke The Netherlands | |
dc.contributor.institution | Faculty of Earth and Life Science; Department of Earth Sciences, Vrije Universiteit; Amsterdam The Netherlands | |
dc.contributor.institution | Faculty of Geosciences; Department of Earth Sciences, University of Utrecht; Utrecht The Netherlands | |
kaust.person | Duarte, Carlos M. | |
kaust.person | Agusti, Susana | |
refterms.dateFOA | 2018-06-14T05:13:46Z | |
dc.date.published-online | 2017-03-27 | |
dc.date.published-print | 2017-05 |
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